Multiphoton ionization and excitation spectra of fluoranthene and benzene in dilute solutions of n-pentane have been measured utilizing, respectively, a sensitive multiphoton conductivity and a two-photon excitation technique. The order of the multiphoton ionization process in benzene solutions has been determined, and its significance in the determination of the ionization threshold of benzene in solution is discussed. The potential capability of the multiphoton ionization technique to laser-analytical instrumentation in the liquid phase is indicated.

Topics
General procedures and instrumentation, Heterocyclic compounds, Atomic and molecular spectra, Photoionization
1.
Ziegler
,
L. D.
 and
B. S.
Hudson
 (
1982
). Excited States. Vol.
5
.
E. C.
Lim
, Ed.
Academic Press
,
New York
.
41
–
140
.
2.
Siomos
,
K.
,
H.
Faidas
, and
L. G.
Christophorou
 (
1984
). Laser Techniques in the Extreme Ultraviolet.
S.
Harris
 and
T.
Lucatorto
, Eds.
American Institute of Physics
,
New York
.
135
–
142
.
3.
Siomos
,
K.
 and
L. G.
Christophorou
 (
1980
).
Laser Two-Photon Ionization Spectroscopy of Molecules in Liquids
.
CHEM. PHYS. LETT.
72
:
43
–
48
.
Google Scholar
Crossref
Search ADS
 
4.
Kopp
,
M. K.
 and
J. A.
Williams
 (
1977
).
Low-Noise Voltage-Sensitive Preamplifier with Output Stabilization by Pole-Zero Cancellation in the Feedback Circuit
.
REV. SCI. INSTRUM.
48
:
383
–
388
.
Google Scholar
Crossref
Search ADS
 
5.
Siomos
,
K.
,
H.
Faidas
, and
G.
Hohlneicher
 (in preparation).
6.
Heilbronner
,
E.
,
J. P.
Weber
,
J.
Michl
, and
R.
Zahradnik
 (
1966
).
The Electronic Spectra of Acenaphthylene and Fluoranthene
.
THEOR. CHIM. ACTA (Berl.).
6
:
141
–
158
.
Google Scholar
Crossref
Search ADS
 
7.
Kolc
,
J.
,
E. W.
Thulstrup
, and
J.
Michl
 (
1974
).
Excited Singlet States of Fluoranthene. I. Absorption, Linear and Magnetic Circular Dichroism, and Polarized Fluorescence Excitation of the Fluorofluoranthenes
.
J. AM. CHEM. SOC.
96
:
7188
–
7202
.
Google Scholar
Crossref
Search ADS
 
8.
Siomos
,
K.
,
G.
Kourouklis
, and
L. G.
Christophorou
 (
1981
).
Laser Two-Photon Ionization of Organic Molecules in Dielectric Liquids
.
CHEM. PHYS. LETT.
80
:
504
–
511
.
Google Scholar
Crossref
Search ADS
 
9.
Siomos
,
K.
 and
H.
Faidas
 (in preparation).
10.
The ionization threshold of a molecule in the liquid phase is lower than its corresponding ionization threshold in the gas phase
.
11.
Collomon
,
J. H.
,
J. E.
Parkin
, and
R.
Lopez
-Delgado (
1972
).
Nonradiative Relaxation of the Excited Ã1B2U State of Benzene
.
CHEM. PHYS. LETT.
13
:
125
–
131
.
Google Scholar
Crossref
Search ADS
 
12.
Spears
,
K. G.
 and
S. A.
Rice
 (
1971
).
Study of the Lifetimes of Individual Vibronic States of the Isolated Benzene Molecule
.
J. CHEM. PHYS.
55
:
5561
–
5581
.
Google Scholar
Crossref
Search ADS
 
13.
Otis
,
C. E.
,
J. L.
Knee
, and
P. M.
Johnson
 (
1983
).
Nonradiative Processes in the Channel Three Region of the S1 State of Ultracold Benzene
.
J. PHYS. CHEM.
87
:
2232
–
2239
.
Google Scholar
Crossref
Search ADS
 
14.
Formosinho
,
S. J.
 and
J.
Dias Da Silva
 (
1974
).
On the Nature of Nonradiative Channels in Benzene
.
MOL PHOTOCHEM.
6
:
409
–
424
.
Google Scholar
 
This content is only available via PDF.
© 1985 Laser Institute of America.
1985
Laser Institute of America
You do not currently have access to this content.